SUITABLE FOR MOST HELMETS: During testing, the Comtac I and Comtac II headsets can be perfectly combined with this headset adapter. And it can be matched with a full range of FAST, ACH and MICH helmets, as they have arc rails on the side COMFORTABLE TO USE: Dramatically improves the comfort and protection of your helmet, you no longer have to fight for space inside your helmet or remove helmet pads to fit a helmet. SPECIAL DESIGN: After hanging after the Comtac intercom headset, the headset will be separated from the arc-shaped headband, used on the board directly to the hanging chain. FREE ROTATION: the buckle to hang can be attached to the helmet on 2 sides of the helmet rails. EASY ASSEMBLY: requires some assembly, mainly removing the earmuffs from the headband, then clipping them onto the adapters